Carroll symmetry also appears in the tensionless limit of string theory. In this limit the worldsheet metric becomes degenerate and BMS\(_3\)  replaces the worldsheet conformal symmetry [1]}, [2]}, [3]}, [4]}, [5]}.
It has been shown in [6]} that strings probing black hole geometries become effectively tensionless near the horizon of the black hole. The background Carroll structure of the blackhole event horizon induces a Carroll structure on the worldsheet of the string. Rather intriguingly, in a recent paper [7]}, it has been shown that null strings wrapping the horizon of a BTZ black hole in asymptotically AdS spacetimes can give an explicit counting of its microstates, reproducing not only the leading Bekenstein-Hawking entropy but amazingly even its logarithmic corrections correctly.
